GoKawiilHiddenLayer raises $100M Series B as AI security spending surges
AI security startup HiddenLayer has closed a $100 million Series B led by Delta-v Capital, with Ten Eleven Ventures and others joining. CEO Chris Sestito says annual recurring revenue grew more than 10x in the past year, reaching the tens of millions, driven mostly by new enterprise customers in financial services, big tech, and government agencies including the Department of Defense.
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Just three years ago it was unclear whether AI-specific threats were common enough to sustain a dedicated security market; now Gartner projects spending on AI security tools will hit $2.83 billion this year and nearly $4.78 billion next year. HiddenLayer's rapid growth signals that enterprises deploying AI agents and models are treating adversarial attacks and vulnerabilities as urgent operational risks rather than theoretical concerns.
- HiddenLayer's ARR grew more than 10x in one year, now in the tens of millions of dollars.
- Gartner forecasts AI security spending will nearly double from 2025 to 2026, reaching $4.78 billion.
- Customers reportedly include a major frontier model provider, financial firms, and U.S. defense and intelligence agencies.
Adversarial AI Attacks, Mitigations, and Defense Strategies" book — If HiddenLayer's raise has you wondering what attacks on models and agents actually look like, this book walks through prompt injection, model poisoning, and the defensive playbook security teams are now building out. It's a practical way for engineers and security leads to get up to speed on the exact threat category driving this spending surge.
See Adversarial AI Attacks, Mitigations, and Defense Strategies" book on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: techcrunch.com — Ram Iyer, 2026-09-02
Published there as: “HiddenLayer nabs $100M as enterprises rush to secure their AI deployments”
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